Abstract
The goal of this work is to compare the main air turbulence characteristics of two common areas in the Amazonian landscape: a dense forest (rough surface) and a water surface (smooth surface). Using wind components data collected at high frequency by sonic anemometers located just above these surfaces, turbulence intensity and power spectra, temporal and length scales of the eddies, as well as the main terms of the TKE budget (TKE = turbulent kinetic energy) were evaluated for each surface type. The results showed that in general, the air turbulence intensity above the forest was higher than above the lake during the daytime, due to the high efficiency of the forest in absorbing the momentum of the turbulent flow. During the nighttime, the situation was reversed, with greater air turbulence intensity above the lake, except in some periods in which intermittent turbulence bursts occured above the forest.
Highlights
It is known that the structure of atmospheric turbulence in the surface boundary layer will depend on the degree of surface roughness [1]
It is known that turbulence processes in the atmospheric surface layer play a major role in the transport of momentum, sensible and latent heat fluxes [5], in the surface layer where the turbulent fluxes are essential for mediating the interactions between the atmosphere and surface
The goal of this work was to compare the main characteristics of the air turbulence of two common areas in the Amazonian landscape: a dense forest and a water surface
Summary
It is known that the structure of atmospheric turbulence in the surface boundary layer will depend on the degree of surface roughness [1]. The turbulent structures in horizontally homogeneous surface layers are well known [6], for rough surfaces, as is the case of the Amazonian forest, a better understanding of such structures is still needed Research on this subject has been conducted for over 30 years in the Amazon region [7,8,9,10,11,12,13], but there are practically no studies that attempt to understand the structure of turbulence above water surfaces such as lakes in this region [14]. Such lakes have the peculiarity of being frequently surrounded by primary forests
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